mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 487

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

16.3.2.9
1
2
Freescale Semiconductor
DBG
BKP
EXTCMP
See
See
comparators A and B in DBG mode only).
PAGSEL
Reset
Field
7:6
5:0
1
2
Figure
Figure 16-10
W
R
Not FLASH/ROM access
16-16.
Page Selector Field — If DBGEN is set in DBGC1, then PAGSEL selects the type of paging as shown in
Table
DPAGE and EPAGE are not yet implemented so the value in bit 7 will be ignored (i.e., PAGSEL values of 10 and
11 will be interpreted as values of 00 and 01, respectively).
In BKP mode, PAGSEL has no meaning and EXTCMP[5:0] are compared to address bits [19:14] if the address
is in the FLASH/ROM memory space.
Comparator A Extended Compare Bits — The EXTCMP bits are used as comparison address bits as shown
in
FLASH/ROM access
Debug Comparator A Extended Register (DBGCAX)
NOTES:
1. In BKP mode, PAGSEL has no functionality. Therefore, set PAGSEL to 00 (reset state).
2. Current HCS12 implementations are limited to six PPAGE bits, PIX[5:0].
0
7
Table 16-20
Mode
PORTK/XAB
PAGSEL = 00
PAGSEL = 01
PAGSEL
(note that while this figure provides extended comparisons for comparator C, the figure also pertains to
Figure 16-16. Comparators A and B Extended Comparison in BKP Mode
16-20.
DBGCXX
PPAGE
Figure 16-15. Debug Comparator A Extended Register (DBGCAX)
along with the appropriate PPAGE, DPAGE, or EPAGE signal from the core.
0
6
XAB21
PIX7
SEE NOTE 1
SEE NOTE 2
0
PAGSEL
Table 16-20. Comparator A or B Compares
Table 16-19. DBGCAX Field Descriptions
XAB20
PIX6
0
MC9S12E256 Data Sheet, Rev. 1.08
0
5
EXTCMP[5:0] = XAB[19:14]
EXTCMP[5:0] = XAB[21:16]
EXTCMP Compare
XAB19
PIX5
5
No compare
No compare
0
4
XAB18
PIX4
4
Description
XAB17
PIX3
3
EXTCMP
3
0
EXTCMP
XAB16
PIX2
2
DBGCxH[7:0] = XAB[15:14], AB[13:8]
XAB15
0
2
PIX1
DBGCxH[7:0] = AB[15:8]
DBGCxH[7:0] = AB[15:8]
DBGCxH[5:0] = AB[13:8]
1
High-Byte Compare
Chapter 16 Debug Module (DBGV1)
XAB14
BIT 0
PIX0
0
1
0
0
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